| 1 | !> @file lpm_collision_kernels.f90 |
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| 2 | !------------------------------------------------------------------------------! |
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| 3 | ! This file is part of the PALM model system. |
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| 4 | ! |
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| 5 | ! PALM is free software: you can redistribute it and/or modify it under the |
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| 6 | ! terms of the GNU General Public License as published by the Free Software |
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| 7 | ! Foundation, either version 3 of the License, or (at your option) any later |
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| 8 | ! version. |
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| 9 | ! |
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| 10 | ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY |
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| 11 | ! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR |
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| 12 | ! A PARTICULAR PURPOSE. See the GNU General Public License for more details. |
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| 13 | ! |
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| 14 | ! You should have received a copy of the GNU General Public License along with |
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| 15 | ! PALM. If not, see <http://www.gnu.org/licenses/>. |
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| 16 | ! |
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| 17 | ! Copyright 1997-2018 Leibniz Universitaet Hannover |
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| 18 | !------------------------------------------------------------------------------! |
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| 19 | ! |
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| 20 | ! Current revisions: |
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| 21 | ! ----------------- |
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| 22 | ! |
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| 23 | ! |
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| 24 | ! Former revisions: |
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| 25 | ! ----------------- |
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| 26 | ! $Id: lpm_collision_kernels.f90 2718 2018-01-02 08:49:38Z Giersch $ |
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| 27 | ! Corrected "Former revisions" section |
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| 28 | ! |
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| 29 | ! 2696 2017-12-14 17:12:51Z kanani |
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| 30 | ! Change in file header (GPL part) |
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| 31 | ! |
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| 32 | ! 2101 2017-01-05 16:42:31Z suehring |
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| 33 | ! |
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| 34 | ! 2000 2016-08-20 18:09:15Z knoop |
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| 35 | ! Forced header and separation lines into 80 columns |
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| 36 | ! |
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| 37 | ! 1880 2016-04-20 09:36:50Z hoffmann |
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| 38 | ! Bugfix: The index of the larger particle has to be chosen for interpolation. |
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| 39 | ! |
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| 40 | ! 1873 2016-04-18 14:50:06Z maronga |
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| 41 | ! Module renamed (removed _mod) |
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| 42 | ! |
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| 43 | ! 1858 2016-04-13 13:12:11Z hoffmann |
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| 44 | ! Interpolation of collision kernels adjusted to more reasonable values. |
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| 45 | ! Reformatting of the code. |
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| 46 | ! |
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| 47 | ! 1850 2016-04-08 13:29:27Z maronga |
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| 48 | ! Module renamed |
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| 49 | ! |
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| 50 | ! 1822 2016-04-07 07:49:42Z hoffmann |
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| 51 | ! PALM kernel has been deleted. |
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| 52 | ! Bugfix in the calculation of the turbulent enhancement factor of the |
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| 53 | ! collection efficiency. |
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| 54 | ! |
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| 55 | ! Unused variables removed. |
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| 56 | ! |
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| 57 | ! 1776 2016-03-02 17:54:58Z hoffmann |
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| 58 | ! Bugfix: Collection efficiencies must be calculated for the larger droplet. |
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| 59 | ! |
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| 60 | ! 1682 2015-10-07 23:56:08Z knoop |
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| 61 | ! Code annotations made doxygen readable |
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| 62 | ! |
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| 63 | ! 1519 2015-01-08 10:20:42Z hoffmann |
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| 64 | ! Bugfix: Using the new particle structure, particles are not sorted by size. |
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| 65 | ! Hence, computation of collision efficiencies must ensure that the ratio of |
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| 66 | ! two colliding droplets is < 1. |
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| 67 | ! |
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| 68 | ! 1359 2014-04-11 17:15:14Z hoffmann |
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| 69 | ! New particle structure integrated. |
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| 70 | ! Kind definition added to all floating point numbers. |
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| 71 | ! |
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| 72 | ! 1346 2014-03-27 13:18:20Z heinze |
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| 73 | ! Bugfix: REAL constants provided with KIND-attribute especially in call of |
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| 74 | ! intrinsic function like MAX, MIN, SIGN |
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| 75 | ! |
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| 76 | ! 1322 2014-03-20 16:38:49Z raasch |
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| 77 | ! REAL constants defined as wp_kind |
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| 78 | ! |
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| 79 | ! 1320 2014-03-20 08:40:49Z |
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| 80 | ! ONLY-attribute added to USE-statements, |
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| 81 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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| 82 | ! kinds are defined in new module kinds, |
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| 83 | ! revision history before 2012 removed, |
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| 84 | ! comment fields (!:) to be used for variable explanations added to |
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| 85 | ! all variable declaration statements |
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| 86 | ! |
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| 87 | ! 1092 2013-02-02 11:24:22Z raasch |
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| 88 | ! unused variables removed |
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| 89 | ! |
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| 90 | ! 1071 2012-11-29 16:54:55Z franke |
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| 91 | ! Bugfix: collision efficiencies for Hall kernel should not be < 1.0E-20 |
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| 92 | ! |
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| 93 | ! 1036 2012-10-22 13:43:42Z raasch |
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| 94 | ! code put under GPL (PALM 3.9) |
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| 95 | ! |
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| 96 | ! 1007 2012-09-19 14:30:36Z franke |
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| 97 | ! converted all units to SI units and replaced some parameters by corresponding |
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| 98 | ! PALM parameters |
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| 99 | ! Bugfix: factor in calculation of enhancement factor for collision efficencies |
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| 100 | ! changed from 10. to 1.0 |
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| 101 | ! |
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| 102 | ! 849 2012-03-15 10:35:09Z raasch |
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| 103 | ! routine collision_efficiency_rogers added (moved from former advec_particles |
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| 104 | ! to here) |
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| 105 | ! |
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| 106 | ! 835 2012-02-22 11:21:19Z raasch $ |
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| 107 | ! Bugfix: array diss can be used only in case of Wang kernel |
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| 108 | ! |
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| 109 | ! 828 2012-02-21 12:00:36Z raasch |
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| 110 | ! code has been completely reformatted, routine colker renamed |
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| 111 | ! recalculate_kernel, |
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| 112 | ! routine init_kernels added, radius is now communicated to the collision |
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| 113 | ! routines by array radclass |
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| 114 | ! |
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| 115 | ! Bugfix: transformation factor for dissipation changed from 1E5 to 1E4 |
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| 116 | ! |
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| 117 | ! 825 2012-02-19 03:03:44Z raasch |
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| 118 | ! routine renamed from wang_kernel to lpm_collision_kernels, |
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| 119 | ! turbulence_effects on collision replaced by wang_kernel |
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| 120 | ! |
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| 121 | ! 790 2011-11-29 03:11:20Z raasch |
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| 122 | ! initial revision |
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| 123 | ! |
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| 124 | ! Description: |
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| 125 | ! ------------ |
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| 126 | !> This module calculates collision efficiencies either due to pure gravitational |
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| 127 | !> effects (Hall kernel, see Hall, 1980: J. Atmos. Sci., 2486-2507) or |
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| 128 | !> including the effects of turbulence (Wang kernel, see Wang and |
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| 129 | !> Grabowski, 2009: Atmos. Sci. Lett., 10, 1-8, and Ayala et al., 2008: |
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| 130 | !> New J. Phys., 10, 075016). The original code has been |
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| 131 | !> provided by L.-P. Wang but is substantially reformatted and speed optimized |
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| 132 | !> here. |
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| 133 | !------------------------------------------------------------------------------! |
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| 134 | MODULE lpm_collision_kernels_mod |
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| 135 | |
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| 136 | |
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| 137 | USE constants, & |
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| 138 | ONLY: pi |
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| 139 | |
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| 140 | USE kinds |
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| 141 | |
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| 142 | USE particle_attributes, & |
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| 143 | ONLY: collision_kernel, dissipation_classes, particles, & |
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| 144 | radius_classes |
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| 145 | |
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| 146 | USE pegrid |
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| 147 | |
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| 148 | |
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| 149 | IMPLICIT NONE |
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| 150 | |
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| 151 | PRIVATE |
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| 152 | |
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| 153 | PUBLIC ckernel, init_kernels, rclass_lbound, rclass_ubound, & |
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| 154 | recalculate_kernel |
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| 155 | |
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| 156 | REAL(wp) :: epsilon !< |
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| 157 | REAL(wp) :: rclass_lbound !< |
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| 158 | REAL(wp) :: rclass_ubound !< |
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| 159 | REAL(wp) :: urms !< |
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| 160 | |
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| 161 | REAL(wp), DIMENSION(:), ALLOCATABLE :: epsclass !< dissipation rate class |
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| 162 | REAL(wp), DIMENSION(:), ALLOCATABLE :: radclass !< radius class |
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| 163 | REAL(wp), DIMENSION(:), ALLOCATABLE :: winf !< |
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| 164 | |
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| 165 | REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ec !< |
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| 166 | REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ecf !< |
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| 167 | REAL(wp), DIMENSION(:,:), ALLOCATABLE :: gck !< |
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| 168 | REAL(wp), DIMENSION(:,:), ALLOCATABLE :: hkernel !< |
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| 169 | REAL(wp), DIMENSION(:,:), ALLOCATABLE :: hwratio !< |
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| 170 | |
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| 171 | REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: ckernel !< |
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| 172 | |
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| 173 | SAVE |
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| 174 | |
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| 175 | ! |
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| 176 | !-- Public interfaces |
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| 177 | INTERFACE init_kernels |
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| 178 | MODULE PROCEDURE init_kernels |
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| 179 | END INTERFACE init_kernels |
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| 180 | |
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| 181 | INTERFACE recalculate_kernel |
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| 182 | MODULE PROCEDURE recalculate_kernel |
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| 183 | END INTERFACE recalculate_kernel |
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| 184 | |
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| 185 | |
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| 186 | CONTAINS |
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| 187 | |
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| 188 | |
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| 189 | !------------------------------------------------------------------------------! |
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| 190 | ! Description: |
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| 191 | ! ------------ |
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| 192 | !> Initialization of the collision efficiency matrix with fixed radius and |
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| 193 | !> dissipation classes, calculated at simulation start only. |
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| 194 | !------------------------------------------------------------------------------! |
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| 195 | |
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| 196 | SUBROUTINE init_kernels |
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| 197 | |
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| 198 | IMPLICIT NONE |
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| 199 | |
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| 200 | INTEGER(iwp) :: i !< |
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| 201 | INTEGER(iwp) :: j !< |
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| 202 | INTEGER(iwp) :: k !< |
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| 203 | |
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| 204 | |
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| 205 | ! |
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| 206 | !-- Calculate collision efficiencies for fixed radius- and dissipation |
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| 207 | !-- classes |
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| 208 | IF ( collision_kernel(6:9) == 'fast' ) THEN |
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| 209 | |
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| 210 | ALLOCATE( ckernel(1:radius_classes,1:radius_classes, & |
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| 211 | 0:dissipation_classes), epsclass(1:dissipation_classes), & |
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| 212 | radclass(1:radius_classes) ) |
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| 213 | |
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| 214 | ! |
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| 215 | !-- Calculate the radius class bounds with logarithmic distances |
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| 216 | !-- in the interval [1.0E-6, 1000.0E-6] m |
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| 217 | rclass_lbound = LOG( 1.0E-6_wp ) |
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| 218 | rclass_ubound = LOG( 1000.0E-6_wp ) |
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| 219 | radclass(1) = EXP( rclass_lbound ) |
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| 220 | DO i = 2, radius_classes |
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| 221 | radclass(i) = EXP( rclass_lbound + & |
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| 222 | ( rclass_ubound - rclass_lbound ) * & |
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| 223 | ( i - 1.0_wp ) / ( radius_classes - 1.0_wp ) ) |
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| 224 | ENDDO |
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| 225 | |
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| 226 | ! |
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| 227 | !-- Set the class bounds for dissipation in interval [0.0, 600.0] cm**2/s**3 |
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| 228 | DO i = 1, dissipation_classes |
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| 229 | epsclass(i) = 0.06_wp * REAL( i, KIND=wp ) / dissipation_classes |
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| 230 | ENDDO |
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| 231 | ! |
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| 232 | !-- Calculate collision efficiencies of the Wang/ayala kernel |
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| 233 | ALLOCATE( ec(1:radius_classes,1:radius_classes), & |
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| 234 | ecf(1:radius_classes,1:radius_classes), & |
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| 235 | gck(1:radius_classes,1:radius_classes), & |
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| 236 | winf(1:radius_classes) ) |
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| 237 | |
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| 238 | DO k = 1, dissipation_classes |
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| 239 | |
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| 240 | epsilon = epsclass(k) |
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| 241 | urms = 2.02_wp * ( epsilon / 0.04_wp )**( 1.0_wp / 3.0_wp ) |
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| 242 | |
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| 243 | CALL turbsd |
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| 244 | CALL turb_enhance_eff |
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| 245 | CALL effic |
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| 246 | |
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| 247 | DO j = 1, radius_classes |
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| 248 | DO i = 1, radius_classes |
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| 249 | ckernel(i,j,k) = ec(i,j) * gck(i,j) * ecf(i,j) |
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| 250 | ENDDO |
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| 251 | ENDDO |
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| 252 | |
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| 253 | ENDDO |
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| 254 | |
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| 255 | ! |
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| 256 | !-- Calculate collision efficiencies of the Hall kernel |
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| 257 | ALLOCATE( hkernel(1:radius_classes,1:radius_classes), & |
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| 258 | hwratio(1:radius_classes,1:radius_classes) ) |
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| 259 | |
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| 260 | CALL fallg |
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| 261 | CALL effic |
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| 262 | |
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| 263 | DO j = 1, radius_classes |
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| 264 | DO i = 1, radius_classes |
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| 265 | hkernel(i,j) = pi * ( radclass(j) + radclass(i) )**2 & |
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| 266 | * ec(i,j) * ABS( winf(j) - winf(i) ) |
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| 267 | ckernel(i,j,0) = hkernel(i,j) ! hall kernel stored on index 0 |
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| 268 | ENDDO |
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| 269 | ENDDO |
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| 270 | |
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| 271 | ! |
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| 272 | !-- Test output of efficiencies |
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| 273 | IF ( j == -1 ) THEN |
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| 274 | |
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| 275 | PRINT*, '*** Hall kernel' |
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| 276 | WRITE ( *,'(5X,20(F4.0,1X))' ) ( radclass(i)*1.0E6_wp, & |
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| 277 | i = 1,radius_classes ) |
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| 278 | DO j = 1, radius_classes |
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| 279 | WRITE ( *,'(F4.0,1X,20(F8.4,1X))' ) radclass(j), & |
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| 280 | ( hkernel(i,j), i = 1,radius_classes ) |
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| 281 | ENDDO |
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| 282 | |
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| 283 | DO k = 1, dissipation_classes |
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| 284 | DO i = 1, radius_classes |
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| 285 | DO j = 1, radius_classes |
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| 286 | IF ( hkernel(i,j) == 0.0_wp ) THEN |
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| 287 | hwratio(i,j) = 9999999.9_wp |
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| 288 | ELSE |
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| 289 | hwratio(i,j) = ckernel(i,j,k) / hkernel(i,j) |
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| 290 | ENDIF |
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| 291 | ENDDO |
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| 292 | ENDDO |
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| 293 | |
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| 294 | PRINT*, '*** epsilon = ', epsclass(k) |
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| 295 | WRITE ( *,'(5X,20(F4.0,1X))' ) ( radclass(i) * 1.0E6_wp, & |
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| 296 | i = 1,radius_classes ) |
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| 297 | DO j = 1, radius_classes |
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| 298 | WRITE ( *,'(F4.0,1X,20(F8.4,1X))' ) radclass(j) * 1.0E6_wp, & |
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| 299 | ( hwratio(i,j), i = 1,radius_classes ) |
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| 300 | ENDDO |
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| 301 | ENDDO |
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| 302 | |
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| 303 | ENDIF |
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| 304 | |
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| 305 | DEALLOCATE( ec, ecf, epsclass, gck, hkernel, winf ) |
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| 306 | |
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| 307 | ENDIF |
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| 308 | |
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| 309 | END SUBROUTINE init_kernels |
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| 310 | |
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| 311 | |
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| 312 | !------------------------------------------------------------------------------! |
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| 313 | ! Description: |
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| 314 | ! ------------ |
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| 315 | !> Calculation of collision kernels during each timestep and for each grid box |
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| 316 | !------------------------------------------------------------------------------! |
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| 317 | SUBROUTINE recalculate_kernel( i1, j1, k1 ) |
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| 318 | |
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| 319 | USE arrays_3d, & |
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| 320 | ONLY: diss |
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| 321 | |
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| 322 | USE particle_attributes, & |
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| 323 | ONLY: number_of_particles, prt_count, radius_classes, wang_kernel |
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| 324 | |
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| 325 | IMPLICIT NONE |
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| 326 | |
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| 327 | INTEGER(iwp) :: i !< |
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| 328 | INTEGER(iwp) :: i1 !< |
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| 329 | INTEGER(iwp) :: j !< |
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| 330 | INTEGER(iwp) :: j1 !< |
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| 331 | INTEGER(iwp) :: k1 !< |
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| 332 | |
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| 333 | |
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| 334 | number_of_particles = prt_count(k1,j1,i1) |
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| 335 | radius_classes = number_of_particles ! necessary to use the same |
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| 336 | ! subroutines as for |
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| 337 | ! precalculated kernels |
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| 338 | |
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| 339 | ALLOCATE( ec(1:number_of_particles,1:number_of_particles), & |
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| 340 | radclass(1:number_of_particles), winf(1:number_of_particles) ) |
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| 341 | |
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| 342 | ! |
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| 343 | !-- Store particle radii on the radclass array |
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| 344 | radclass(1:number_of_particles) = particles(1:number_of_particles)%radius |
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| 345 | |
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| 346 | IF ( wang_kernel ) THEN |
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| 347 | epsilon = diss(k1,j1,i1) ! dissipation rate in m**2/s**3 |
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| 348 | ELSE |
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| 349 | epsilon = 0.0_wp |
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| 350 | ENDIF |
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| 351 | urms = 2.02_wp * ( epsilon / 0.04_wp )**( 0.33333333333_wp ) |
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| 352 | |
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| 353 | IF ( wang_kernel .AND. epsilon > 1.0E-7_wp ) THEN |
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| 354 | ! |
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| 355 | !-- Call routines to calculate efficiencies for the Wang kernel |
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| 356 | ALLOCATE( gck(1:number_of_particles,1:number_of_particles), & |
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| 357 | ecf(1:number_of_particles,1:number_of_particles) ) |
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| 358 | |
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| 359 | CALL turbsd |
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| 360 | CALL turb_enhance_eff |
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| 361 | CALL effic |
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| 362 | |
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| 363 | DO j = 1, number_of_particles |
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| 364 | DO i = 1, number_of_particles |
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| 365 | ckernel(1+i-1,1+j-1,1) = ec(i,j) * gck(i,j) * ecf(i,j) |
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| 366 | ENDDO |
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| 367 | ENDDO |
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| 368 | |
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| 369 | DEALLOCATE( gck, ecf ) |
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| 370 | |
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| 371 | ELSE |
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| 372 | ! |
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| 373 | !-- Call routines to calculate efficiencies for the Hall kernel |
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| 374 | CALL fallg |
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| 375 | CALL effic |
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| 376 | |
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| 377 | DO j = 1, number_of_particles |
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| 378 | DO i = 1, number_of_particles |
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| 379 | ckernel(i,j,1) = pi * ( radclass(j) + radclass(i) )**2 & |
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| 380 | * ec(i,j) * ABS( winf(j) - winf(i) ) |
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| 381 | ENDDO |
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| 382 | ENDDO |
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| 383 | |
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| 384 | ENDIF |
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| 385 | |
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| 386 | DEALLOCATE( ec, radclass, winf ) |
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| 387 | |
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| 388 | END SUBROUTINE recalculate_kernel |
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| 389 | |
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| 390 | |
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| 391 | !------------------------------------------------------------------------------! |
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| 392 | ! Description: |
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| 393 | ! ------------ |
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| 394 | !> Calculation of effects of turbulence on the geometric collision kernel |
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| 395 | !> (by including the droplets' average radial relative velocities and their |
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| 396 | !> radial distribution function) following the analytic model by Aayala et al. |
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| 397 | !> (2008, New J. Phys.). For details check the second part 2 of the publication, |
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| 398 | !> page 37ff. |
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| 399 | !> |
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| 400 | !> Input parameters, which need to be replaced by PALM parameters: |
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| 401 | !> water density, air density |
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| 402 | !------------------------------------------------------------------------------! |
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| 403 | SUBROUTINE turbsd |
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| 404 | |
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| 405 | USE control_parameters, & |
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| 406 | ONLY: g, molecular_viscosity |
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| 407 | |
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| 408 | USE particle_attributes, & |
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| 409 | ONLY: radius_classes |
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| 410 | |
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| 411 | IMPLICIT NONE |
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| 412 | |
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| 413 | INTEGER(iwp) :: i !< |
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| 414 | INTEGER(iwp) :: j !< |
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| 415 | |
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| 416 | REAL(wp) :: ao !< |
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| 417 | REAL(wp) :: ao_gr !< |
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| 418 | REAL(wp) :: bbb !< |
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| 419 | REAL(wp) :: be !< |
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| 420 | REAL(wp) :: b1 !< |
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| 421 | REAL(wp) :: b2 !< |
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| 422 | REAL(wp) :: ccc !< |
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| 423 | REAL(wp) :: c1 !< |
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| 424 | REAL(wp) :: c1_gr !< |
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| 425 | REAL(wp) :: c2 !< |
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| 426 | REAL(wp) :: d1 !< |
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| 427 | REAL(wp) :: d2 !< |
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| 428 | REAL(wp) :: eta !< |
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| 429 | REAL(wp) :: e1 !< |
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| 430 | REAL(wp) :: e2 !< |
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| 431 | REAL(wp) :: fao_gr !< |
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| 432 | REAL(wp) :: fr !< |
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| 433 | REAL(wp) :: grfin !< |
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| 434 | REAL(wp) :: lambda !< |
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| 435 | REAL(wp) :: lambda_re !< |
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| 436 | REAL(wp) :: lf !< |
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| 437 | REAL(wp) :: rc !< |
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| 438 | REAL(wp) :: rrp !< |
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| 439 | REAL(wp) :: sst !< |
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| 440 | REAL(wp) :: tauk !< |
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| 441 | REAL(wp) :: tl !< |
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| 442 | REAL(wp) :: t2 !< |
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| 443 | REAL(wp) :: tt !< |
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| 444 | REAL(wp) :: t1 !< |
|---|
| 445 | REAL(wp) :: vk !< |
|---|
| 446 | REAL(wp) :: vrms1xy !< |
|---|
| 447 | REAL(wp) :: vrms2xy !< |
|---|
| 448 | REAL(wp) :: v1 !< |
|---|
| 449 | REAL(wp) :: v1v2xy !< |
|---|
| 450 | REAL(wp) :: v1xysq !< |
|---|
| 451 | REAL(wp) :: v2 !< |
|---|
| 452 | REAL(wp) :: v2xysq !< |
|---|
| 453 | REAL(wp) :: wrfin !< |
|---|
| 454 | REAL(wp) :: wrgrav2 !< |
|---|
| 455 | REAL(wp) :: wrtur2xy !< |
|---|
| 456 | REAL(wp) :: xx !< |
|---|
| 457 | REAL(wp) :: yy !< |
|---|
| 458 | REAL(wp) :: z !< |
|---|
| 459 | |
|---|
| 460 | REAL(wp), DIMENSION(1:radius_classes) :: st !< Stokes number |
|---|
| 461 | REAL(wp), DIMENSION(1:radius_classes) :: tau !< inertial time scale |
|---|
| 462 | |
|---|
| 463 | lambda = urms * SQRT( 15.0_wp * molecular_viscosity / epsilon ) |
|---|
| 464 | lambda_re = urms**2 * SQRT( 15.0_wp / epsilon / molecular_viscosity ) |
|---|
| 465 | tl = urms**2 / epsilon |
|---|
| 466 | lf = 0.5_wp * urms**3 / epsilon |
|---|
| 467 | tauk = SQRT( molecular_viscosity / epsilon ) |
|---|
| 468 | eta = ( molecular_viscosity**3 / epsilon )**0.25_wp |
|---|
| 469 | vk = eta / tauk |
|---|
| 470 | |
|---|
| 471 | ao = ( 11.0_wp + 7.0_wp * lambda_re ) / ( 205.0_wp + lambda_re ) |
|---|
| 472 | tt = SQRT( 2.0_wp * lambda_re / ( SQRT( 15.0_wp ) * ao ) ) * tauk |
|---|
| 473 | |
|---|
| 474 | ! |
|---|
| 475 | !-- Get terminal velocity of droplets |
|---|
| 476 | CALL fallg |
|---|
| 477 | |
|---|
| 478 | DO i = 1, radius_classes |
|---|
| 479 | tau(i) = winf(i) / g ! inertial time scale |
|---|
| 480 | st(i) = tau(i) / tauk ! Stokes number |
|---|
| 481 | ENDDO |
|---|
| 482 | |
|---|
| 483 | ! |
|---|
| 484 | !-- Calculate average radial relative velocity at contact (wrfin) |
|---|
| 485 | z = tt / tl |
|---|
| 486 | be = SQRT( 2.0_wp ) * lambda / lf |
|---|
| 487 | bbb = SQRT( 1.0_wp - 2.0_wp * be**2 ) |
|---|
| 488 | d1 = ( 1.0_wp + bbb ) / ( 2.0_wp * bbb ) |
|---|
| 489 | e1 = lf * ( 1.0_wp + bbb ) * 0.5_wp |
|---|
| 490 | d2 = ( 1.0_wp - bbb ) * 0.5_wp / bbb |
|---|
| 491 | e2 = lf * ( 1.0_wp - bbb ) * 0.5_wp |
|---|
| 492 | ccc = SQRT( 1.0_wp - 2.0_wp * z**2 ) |
|---|
| 493 | b1 = ( 1.0_wp + ccc ) * 0.5_wp / ccc |
|---|
| 494 | c1 = tl * ( 1.0_wp + ccc ) * 0.5_wp |
|---|
| 495 | b2 = ( 1.0_wp - ccc ) * 0.5_wp / ccc |
|---|
| 496 | c2 = tl * ( 1.0_wp - ccc ) * 0.5_wp |
|---|
| 497 | |
|---|
| 498 | DO i = 1, radius_classes |
|---|
| 499 | |
|---|
| 500 | v1 = winf(i) |
|---|
| 501 | t1 = tau(i) |
|---|
| 502 | |
|---|
| 503 | DO j = 1, i |
|---|
| 504 | rrp = radclass(i) + radclass(j) |
|---|
| 505 | v2 = winf(j) |
|---|
| 506 | t2 = tau(j) |
|---|
| 507 | |
|---|
| 508 | v1xysq = b1 * d1 * phi_w(c1,e1,v1,t1) - b1 * d2 * phi_w(c1,e2,v1,t1) & |
|---|
| 509 | - b2 * d1 * phi_w(c2,e1,v1,t1) + b2 * d2 * phi_w(c2,e2,v1,t1) |
|---|
| 510 | v1xysq = v1xysq * urms**2 / t1 |
|---|
| 511 | vrms1xy = SQRT( v1xysq ) |
|---|
| 512 | |
|---|
| 513 | v2xysq = b1 * d1 * phi_w(c1,e1,v2,t2) - b1 * d2 * phi_w(c1,e2,v2,t2) & |
|---|
| 514 | - b2 * d1 * phi_w(c2,e1,v2,t2) + b2 * d2 * phi_w(c2,e2,v2,t2) |
|---|
| 515 | v2xysq = v2xysq * urms**2 / t2 |
|---|
| 516 | vrms2xy = SQRT( v2xysq ) |
|---|
| 517 | |
|---|
| 518 | IF ( winf(i) >= winf(j) ) THEN |
|---|
| 519 | v1 = winf(i) |
|---|
| 520 | t1 = tau(i) |
|---|
| 521 | v2 = winf(j) |
|---|
| 522 | t2 = tau(j) |
|---|
| 523 | ELSE |
|---|
| 524 | v1 = winf(j) |
|---|
| 525 | t1 = tau(j) |
|---|
| 526 | v2 = winf(i) |
|---|
| 527 | t2 = tau(i) |
|---|
| 528 | ENDIF |
|---|
| 529 | |
|---|
| 530 | v1v2xy = b1 * d1 * zhi(c1,e1,v1,t1,v2,t2) - & |
|---|
| 531 | b1 * d2 * zhi(c1,e2,v1,t1,v2,t2) - & |
|---|
| 532 | b2 * d1 * zhi(c2,e1,v1,t1,v2,t2) + & |
|---|
| 533 | b2 * d2* zhi(c2,e2,v1,t1,v2,t2) |
|---|
| 534 | fr = d1 * EXP( -rrp / e1 ) - d2 * EXP( -rrp / e2 ) |
|---|
| 535 | v1v2xy = v1v2xy * fr * urms**2 / tau(i) / tau(j) |
|---|
| 536 | wrtur2xy = vrms1xy**2 + vrms2xy**2 - 2.0_wp * v1v2xy |
|---|
| 537 | IF ( wrtur2xy < 0.0_wp ) wrtur2xy = 0.0_wp |
|---|
| 538 | wrgrav2 = pi / 8.0_wp * ( winf(j) - winf(i) )**2 |
|---|
| 539 | wrfin = SQRT( ( 2.0_wp / pi ) * ( wrtur2xy + wrgrav2) ) |
|---|
| 540 | |
|---|
| 541 | ! |
|---|
| 542 | !-- Calculate radial distribution function (grfin) |
|---|
| 543 | IF ( st(j) > st(i) ) THEN |
|---|
| 544 | sst = st(j) |
|---|
| 545 | ELSE |
|---|
| 546 | sst = st(i) |
|---|
| 547 | ENDIF |
|---|
| 548 | |
|---|
| 549 | xx = -0.1988_wp * sst**4 + 1.5275_wp * sst**3 - 4.2942_wp * & |
|---|
| 550 | sst**2 + 5.3406_wp * sst |
|---|
| 551 | IF ( xx < 0.0_wp ) xx = 0.0_wp |
|---|
| 552 | yy = 0.1886_wp * EXP( 20.306_wp / lambda_re ) |
|---|
| 553 | |
|---|
| 554 | c1_gr = xx / ( g / vk * tauk )**yy |
|---|
| 555 | |
|---|
| 556 | ao_gr = ao + ( pi / 8.0_wp) * ( g / vk * tauk )**2 |
|---|
| 557 | fao_gr = 20.115_wp * SQRT( ao_gr / lambda_re ) |
|---|
| 558 | rc = SQRT( fao_gr * ABS( st(j) - st(i) ) ) * eta |
|---|
| 559 | |
|---|
| 560 | grfin = ( ( eta**2 + rc**2 ) / ( rrp**2 + rc**2) )**( c1_gr*0.5_wp ) |
|---|
| 561 | IF ( grfin < 1.0_wp ) grfin = 1.0_wp |
|---|
| 562 | |
|---|
| 563 | ! |
|---|
| 564 | !-- Calculate general collection kernel (without the consideration of |
|---|
| 565 | !-- collection efficiencies) |
|---|
| 566 | gck(i,j) = 2.0_wp * pi * rrp**2 * wrfin * grfin |
|---|
| 567 | gck(j,i) = gck(i,j) |
|---|
| 568 | |
|---|
| 569 | ENDDO |
|---|
| 570 | ENDDO |
|---|
| 571 | |
|---|
| 572 | END SUBROUTINE turbsd |
|---|
| 573 | |
|---|
| 574 | REAL(wp) FUNCTION phi_w( a, b, vsett, tau0 ) |
|---|
| 575 | ! |
|---|
| 576 | !-- Function used in the Ayala et al. (2008) analytical model for turbulent |
|---|
| 577 | !-- effects on the collision kernel |
|---|
| 578 | IMPLICIT NONE |
|---|
| 579 | |
|---|
| 580 | REAL(wp) :: a !< |
|---|
| 581 | REAL(wp) :: aa1 !< |
|---|
| 582 | REAL(wp) :: b !< |
|---|
| 583 | REAL(wp) :: tau0 !< |
|---|
| 584 | REAL(wp) :: vsett !< |
|---|
| 585 | |
|---|
| 586 | aa1 = 1.0_wp / tau0 + 1.0_wp / a + vsett / b |
|---|
| 587 | phi_w = 1.0_wp / aa1 - 0.5_wp * vsett / b / aa1**2 |
|---|
| 588 | |
|---|
| 589 | END FUNCTION phi_w |
|---|
| 590 | |
|---|
| 591 | REAL(wp) FUNCTION zhi( a, b, vsett1, tau1, vsett2, tau2 ) |
|---|
| 592 | ! |
|---|
| 593 | !-- Function used in the Ayala et al. (2008) analytical model for turbulent |
|---|
| 594 | !-- effects on the collision kernel |
|---|
| 595 | IMPLICIT NONE |
|---|
| 596 | |
|---|
| 597 | REAL(wp) :: a !< |
|---|
| 598 | REAL(wp) :: aa1 !< |
|---|
| 599 | REAL(wp) :: aa2 !< |
|---|
| 600 | REAL(wp) :: aa3 !< |
|---|
| 601 | REAL(wp) :: aa4 !< |
|---|
| 602 | REAL(wp) :: aa5 !< |
|---|
| 603 | REAL(wp) :: aa6 !< |
|---|
| 604 | REAL(wp) :: b !< |
|---|
| 605 | REAL(wp) :: tau1 !< |
|---|
| 606 | REAL(wp) :: tau2 !< |
|---|
| 607 | REAL(wp) :: vsett1 !< |
|---|
| 608 | REAL(wp) :: vsett2 !< |
|---|
| 609 | |
|---|
| 610 | aa1 = vsett2 / b - 1.0_wp / tau2 - 1.0_wp / a |
|---|
| 611 | aa2 = vsett1 / b + 1.0_wp / tau1 + 1.0_wp / a |
|---|
| 612 | aa3 = ( vsett1 - vsett2 ) / b + 1.0_wp / tau1 + 1.0_wp / tau2 |
|---|
| 613 | aa4 = ( vsett2 / b )**2 - ( 1.0_wp / tau2 + 1.0_wp / a )**2 |
|---|
| 614 | aa5 = vsett2 / b + 1.0_wp / tau2 + 1.0_wp / a |
|---|
| 615 | aa6 = 1.0_wp / tau1 - 1.0_wp / a + ( 1.0_wp / tau2 + 1.0_wp / a) * & |
|---|
| 616 | vsett1 / vsett2 |
|---|
| 617 | zhi = (1.0_wp / aa1 - 1.0_wp / aa2 ) * ( vsett1 - vsett2 ) * 0.5_wp / & |
|---|
| 618 | b / aa3**2 + ( 4.0_wp / aa4 - 1.0_wp / aa5**2 - 1.0_wp / aa1**2 ) & |
|---|
| 619 | * vsett2 * 0.5_wp / b /aa6 + ( 2.0_wp * ( b / aa2 - b / aa1 ) - & |
|---|
| 620 | vsett1 / aa2**2 + vsett2 / aa1**2 ) * 0.5_wp / b / aa3 |
|---|
| 621 | |
|---|
| 622 | END FUNCTION zhi |
|---|
| 623 | |
|---|
| 624 | |
|---|
| 625 | !------------------------------------------------------------------------------! |
|---|
| 626 | ! Description: |
|---|
| 627 | ! ------------ |
|---|
| 628 | !> Parameterization of terminal velocity following Rogers et al. (1993, J. Appl. |
|---|
| 629 | !> Meteorol.) |
|---|
| 630 | !------------------------------------------------------------------------------! |
|---|
| 631 | SUBROUTINE fallg |
|---|
| 632 | |
|---|
| 633 | USE particle_attributes, & |
|---|
| 634 | ONLY: radius_classes |
|---|
| 635 | |
|---|
| 636 | IMPLICIT NONE |
|---|
| 637 | |
|---|
| 638 | INTEGER(iwp) :: j !< |
|---|
| 639 | |
|---|
| 640 | REAL(wp), PARAMETER :: k_cap_rog = 4.0_wp !< parameter |
|---|
| 641 | REAL(wp), PARAMETER :: k_low_rog = 12.0_wp !< parameter |
|---|
| 642 | REAL(wp), PARAMETER :: a_rog = 9.65_wp !< parameter |
|---|
| 643 | REAL(wp), PARAMETER :: b_rog = 10.43_wp !< parameter |
|---|
| 644 | REAL(wp), PARAMETER :: c_rog = 0.6_wp !< parameter |
|---|
| 645 | REAL(wp), PARAMETER :: d0_rog = 0.745_wp !< seperation diameter |
|---|
| 646 | |
|---|
| 647 | REAL(wp) :: diameter !< droplet diameter in mm |
|---|
| 648 | |
|---|
| 649 | |
|---|
| 650 | DO j = 1, radius_classes |
|---|
| 651 | |
|---|
| 652 | diameter = radclass(j) * 2000.0_wp |
|---|
| 653 | |
|---|
| 654 | IF ( diameter <= d0_rog ) THEN |
|---|
| 655 | winf(j) = k_cap_rog * diameter * ( 1.0_wp - & |
|---|
| 656 | EXP( -k_low_rog * diameter ) ) |
|---|
| 657 | ELSE |
|---|
| 658 | winf(j) = a_rog - b_rog * EXP( -c_rog * diameter ) |
|---|
| 659 | ENDIF |
|---|
| 660 | |
|---|
| 661 | ENDDO |
|---|
| 662 | |
|---|
| 663 | END SUBROUTINE fallg |
|---|
| 664 | |
|---|
| 665 | |
|---|
| 666 | !------------------------------------------------------------------------------! |
|---|
| 667 | ! Description: |
|---|
| 668 | ! ------------ |
|---|
| 669 | !> Interpolation of collision efficiencies (Hall, 1980, J. Atmos. Sci.) |
|---|
| 670 | !------------------------------------------------------------------------------! |
|---|
| 671 | SUBROUTINE effic |
|---|
| 672 | |
|---|
| 673 | USE particle_attributes, & |
|---|
| 674 | ONLY: radius_classes |
|---|
| 675 | |
|---|
| 676 | IMPLICIT NONE |
|---|
| 677 | |
|---|
| 678 | INTEGER(iwp) :: i !< |
|---|
| 679 | INTEGER(iwp) :: iq !< |
|---|
| 680 | INTEGER(iwp) :: ir !< |
|---|
| 681 | INTEGER(iwp) :: j !< |
|---|
| 682 | INTEGER(iwp) :: k !< |
|---|
| 683 | |
|---|
| 684 | INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: ira !< |
|---|
| 685 | |
|---|
| 686 | LOGICAL, SAVE :: first = .TRUE. !< |
|---|
| 687 | |
|---|
| 688 | REAL(wp) :: ek !< |
|---|
| 689 | REAL(wp) :: particle_radius !< |
|---|
| 690 | REAL(wp) :: pp !< |
|---|
| 691 | REAL(wp) :: qq !< |
|---|
| 692 | REAL(wp) :: rq !< |
|---|
| 693 | |
|---|
| 694 | REAL(wp), DIMENSION(1:21), SAVE :: rat !< |
|---|
| 695 | |
|---|
| 696 | REAL(wp), DIMENSION(1:15), SAVE :: r0 !< |
|---|
| 697 | |
|---|
| 698 | REAL(wp), DIMENSION(1:15,1:21), SAVE :: ecoll !< |
|---|
| 699 | |
|---|
| 700 | ! |
|---|
| 701 | !-- Initial assignment of constants |
|---|
| 702 | IF ( first ) THEN |
|---|
| 703 | |
|---|
| 704 | first = .FALSE. |
|---|
| 705 | r0 = (/ 6.0_wp, 8.0_wp, 10.0_wp, 15.0_wp, 20.0_wp, 25.0_wp, & |
|---|
| 706 | 30.0_wp, 40.0_wp, 50.0_wp, 60.0_wp, 70.0_wp, 100.0_wp, & |
|---|
| 707 | 150.0_wp, 200.0_wp, 300.0_wp /) |
|---|
| 708 | |
|---|
| 709 | rat = (/ 0.00_wp, 0.05_wp, 0.10_wp, 0.15_wp, 0.20_wp, 0.25_wp, & |
|---|
| 710 | 0.30_wp, 0.35_wp, 0.40_wp, 0.45_wp, 0.50_wp, 0.55_wp, & |
|---|
| 711 | 0.60_wp, 0.65_wp, 0.70_wp, 0.75_wp, 0.80_wp, 0.85_wp, & |
|---|
| 712 | 0.90_wp, 0.95_wp, 1.00_wp /) |
|---|
| 713 | |
|---|
| 714 | ecoll(:,1) = (/ 0.001_wp, 0.001_wp, 0.001_wp, 0.001_wp, 0.001_wp, & |
|---|
| 715 | 0.001_wp, 0.001_wp, 0.001_wp, 0.001_wp, 0.001_wp, & |
|---|
| 716 | 0.001_wp, 0.001_wp, 0.001_wp, 0.001_wp, 0.001_wp /) |
|---|
| 717 | ecoll(:,2) = (/ 0.003_wp, 0.003_wp, 0.003_wp, 0.004_wp, 0.005_wp, & |
|---|
| 718 | 0.005_wp, 0.005_wp, 0.010_wp, 0.100_wp, 0.050_wp, & |
|---|
| 719 | 0.200_wp, 0.500_wp, 0.770_wp, 0.870_wp, 0.970_wp /) |
|---|
| 720 | ecoll(:,3) = (/ 0.007_wp, 0.007_wp, 0.007_wp, 0.008_wp, 0.009_wp, & |
|---|
| 721 | 0.010_wp, 0.010_wp, 0.070_wp, 0.400_wp, 0.430_wp, & |
|---|
| 722 | 0.580_wp, 0.790_wp, 0.930_wp, 0.960_wp, 1.000_wp /) |
|---|
| 723 | ecoll(:,4) = (/ 0.009_wp, 0.009_wp, 0.009_wp, 0.012_wp, 0.015_wp, & |
|---|
| 724 | 0.010_wp, 0.020_wp, 0.280_wp, 0.600_wp, 0.640_wp, & |
|---|
| 725 | 0.750_wp, 0.910_wp, 0.970_wp, 0.980_wp, 1.000_wp /) |
|---|
| 726 | ecoll(:,5) = (/ 0.014_wp, 0.014_wp, 0.014_wp, 0.015_wp, 0.016_wp, & |
|---|
| 727 | 0.030_wp, 0.060_wp, 0.500_wp, 0.700_wp, 0.770_wp, & |
|---|
| 728 | 0.840_wp, 0.950_wp, 0.970_wp, 1.000_wp, 1.000_wp /) |
|---|
| 729 | ecoll(:,6) = (/ 0.017_wp, 0.017_wp, 0.017_wp, 0.020_wp, 0.022_wp, & |
|---|
| 730 | 0.060_wp, 0.100_wp, 0.620_wp, 0.780_wp, 0.840_wp, & |
|---|
| 731 | 0.880_wp, 0.950_wp, 1.000_wp, 1.000_wp, 1.000_wp /) |
|---|
| 732 | ecoll(:,7) = (/ 0.030_wp, 0.030_wp, 0.024_wp, 0.022_wp, 0.032_wp, & |
|---|
| 733 | 0.062_wp, 0.200_wp, 0.680_wp, 0.830_wp, 0.870_wp, & |
|---|
| 734 | 0.900_wp, 0.950_wp, 1.000_wp, 1.000_wp, 1.000_wp /) |
|---|
| 735 | ecoll(:,8) = (/ 0.025_wp, 0.025_wp, 0.025_wp, 0.036_wp, 0.043_wp, & |
|---|
| 736 | 0.130_wp, 0.270_wp, 0.740_wp, 0.860_wp, 0.890_wp, & |
|---|
| 737 | 0.920_wp, 1.000_wp, 1.000_wp, 1.000_wp, 1.000_wp /) |
|---|
| 738 | ecoll(:,9) = (/ 0.027_wp, 0.027_wp, 0.027_wp, 0.040_wp, 0.052_wp, & |
|---|
| 739 | 0.200_wp, 0.400_wp, 0.780_wp, 0.880_wp, 0.900_wp, & |
|---|
| 740 | 0.940_wp, 1.000_wp, 1.000_wp, 1.000_wp, 1.000_wp /) |
|---|
| 741 | ecoll(:,10) = (/ 0.030_wp, 0.030_wp, 0.030_wp, 0.047_wp, 0.064_wp, & |
|---|
| 742 | 0.250_wp, 0.500_wp, 0.800_wp, 0.900_wp, 0.910_wp, & |
|---|
| 743 | 0.950_wp, 1.000_wp, 1.000_wp, 1.000_wp, 1.000_wp /) |
|---|
| 744 | ecoll(:,11) = (/ 0.040_wp, 0.040_wp, 0.033_wp, 0.037_wp, 0.068_wp, & |
|---|
| 745 | 0.240_wp, 0.550_wp, 0.800_wp, 0.900_wp, 0.910_wp, & |
|---|
| 746 | 0.950_wp, 1.000_wp, 1.000_wp, 1.000_wp, 1.000_wp /) |
|---|
| 747 | ecoll(:,12) = (/ 0.035_wp, 0.035_wp, 0.035_wp, 0.055_wp, 0.079_wp, & |
|---|
| 748 | 0.290_wp, 0.580_wp, 0.800_wp, 0.900_wp, 0.910_wp, & |
|---|
| 749 | 0.950_wp, 1.000_wp, 1.000_wp, 1.000_wp, 1.000_wp /) |
|---|
| 750 | ecoll(:,13) = (/ 0.037_wp, 0.037_wp, 0.037_wp, 0.062_wp, 0.082_wp, & |
|---|
| 751 | 0.290_wp, 0.590_wp, 0.780_wp, 0.900_wp, 0.910_wp, & |
|---|
| 752 | 0.950_wp, 1.000_wp, 1.000_wp, 1.000_wp, 1.000_wp /) |
|---|
| 753 | ecoll(:,14) = (/ 0.037_wp, 0.037_wp, 0.037_wp, 0.060_wp, 0.080_wp, & |
|---|
| 754 | 0.290_wp, 0.580_wp, 0.770_wp, 0.890_wp, 0.910_wp, & |
|---|
| 755 | 0.950_wp, 1.000_wp, 1.000_wp, 1.000_wp, 1.000_wp /) |
|---|
| 756 | ecoll(:,15) = (/ 0.037_wp, 0.037_wp, 0.037_wp, 0.041_wp, 0.075_wp, & |
|---|
| 757 | 0.250_wp, 0.540_wp, 0.760_wp, 0.880_wp, 0.920_wp, & |
|---|
| 758 | 0.950_wp, 1.000_wp, 1.000_wp, 1.000_wp, 1.000_wp /) |
|---|
| 759 | ecoll(:,16) = (/ 0.037_wp, 0.037_wp, 0.037_wp, 0.052_wp, 0.067_wp, & |
|---|
| 760 | 0.250_wp, 0.510_wp, 0.770_wp, 0.880_wp, 0.930_wp, & |
|---|
| 761 | 0.970_wp, 1.000_wp, 1.000_wp, 1.000_wp, 1.000_wp /) |
|---|
| 762 | ecoll(:,17) = (/ 0.037_wp, 0.037_wp, 0.037_wp, 0.047_wp, 0.057_wp, & |
|---|
| 763 | 0.250_wp, 0.490_wp, 0.770_wp, 0.890_wp, 0.950_wp, & |
|---|
| 764 | 1.000_wp, 1.000_wp, 1.000_wp, 1.000_wp, 1.000_wp /) |
|---|
| 765 | ecoll(:,18) = (/ 0.036_wp, 0.036_wp, 0.036_wp, 0.042_wp, 0.048_wp, & |
|---|
| 766 | 0.230_wp, 0.470_wp, 0.780_wp, 0.920_wp, 1.000_wp, & |
|---|
| 767 | 1.020_wp, 1.020_wp, 1.020_wp, 1.020_wp, 1.020_wp /) |
|---|
| 768 | ecoll(:,19) = (/ 0.040_wp, 0.040_wp, 0.035_wp, 0.033_wp, 0.040_wp, & |
|---|
| 769 | 0.112_wp, 0.450_wp, 0.790_wp, 1.010_wp, 1.030_wp, & |
|---|
| 770 | 1.040_wp, 1.040_wp, 1.040_wp, 1.040_wp, 1.040_wp /) |
|---|
| 771 | ecoll(:,20) = (/ 0.033_wp, 0.033_wp, 0.033_wp, 0.033_wp, 0.033_wp, & |
|---|
| 772 | 0.119_wp, 0.470_wp, 0.950_wp, 1.300_wp, 1.700_wp, & |
|---|
| 773 | 2.300_wp, 2.300_wp, 2.300_wp, 2.300_wp, 2.300_wp /) |
|---|
| 774 | ecoll(:,21) = (/ 0.027_wp, 0.027_wp, 0.027_wp, 0.027_wp, 0.027_wp, & |
|---|
| 775 | 0.125_wp, 0.520_wp, 1.400_wp, 2.300_wp, 3.000_wp, & |
|---|
| 776 | 4.000_wp, 4.000_wp, 4.000_wp, 4.000_wp, 4.000_wp /) |
|---|
| 777 | ENDIF |
|---|
| 778 | |
|---|
| 779 | ! |
|---|
| 780 | !-- Calculate the radius class index of particles with respect to array r |
|---|
| 781 | !-- Radius has to be in microns |
|---|
| 782 | ALLOCATE( ira(1:radius_classes) ) |
|---|
| 783 | DO j = 1, radius_classes |
|---|
| 784 | particle_radius = radclass(j) * 1.0E6_wp |
|---|
| 785 | DO k = 1, 15 |
|---|
| 786 | IF ( particle_radius < r0(k) ) THEN |
|---|
| 787 | ira(j) = k |
|---|
| 788 | EXIT |
|---|
| 789 | ENDIF |
|---|
| 790 | ENDDO |
|---|
| 791 | IF ( particle_radius >= r0(15) ) ira(j) = 16 |
|---|
| 792 | ENDDO |
|---|
| 793 | |
|---|
| 794 | ! |
|---|
| 795 | !-- Two-dimensional linear interpolation of the collision efficiency. |
|---|
| 796 | !-- Radius has to be in microns |
|---|
| 797 | DO j = 1, radius_classes |
|---|
| 798 | DO i = 1, j |
|---|
| 799 | |
|---|
| 800 | ir = MAX( ira(i), ira(j) ) |
|---|
| 801 | rq = MIN( radclass(i) / radclass(j), radclass(j) / radclass(i) ) |
|---|
| 802 | iq = INT( rq * 20 ) + 1 |
|---|
| 803 | iq = MAX( iq , 2) |
|---|
| 804 | |
|---|
| 805 | IF ( ir < 16 ) THEN |
|---|
| 806 | IF ( ir >= 2 ) THEN |
|---|
| 807 | pp = ( ( MAX( radclass(j), radclass(i) ) * 1.0E6_wp ) - & |
|---|
| 808 | r0(ir-1) ) / ( r0(ir) - r0(ir-1) ) |
|---|
| 809 | qq = ( rq - rat(iq-1) ) / ( rat(iq) - rat(iq-1) ) |
|---|
| 810 | ec(j,i) = ( 1.0_wp - pp ) * ( 1.0_wp - qq ) & |
|---|
| 811 | * ecoll(ir-1,iq-1) & |
|---|
| 812 | + pp * ( 1.0_wp - qq ) * ecoll(ir,iq-1) & |
|---|
| 813 | + qq * ( 1.0_wp - pp ) * ecoll(ir-1,iq) & |
|---|
| 814 | + pp * qq * ecoll(ir,iq) |
|---|
| 815 | ELSE |
|---|
| 816 | qq = ( rq - rat(iq-1) ) / ( rat(iq) - rat(iq-1) ) |
|---|
| 817 | ec(j,i) = ( 1.0_wp - qq ) * ecoll(1,iq-1) + qq * ecoll(1,iq) |
|---|
| 818 | ENDIF |
|---|
| 819 | ELSE |
|---|
| 820 | qq = ( rq - rat(iq-1) ) / ( rat(iq) - rat(iq-1) ) |
|---|
| 821 | ek = ( 1.0_wp - qq ) * ecoll(15,iq-1) + qq * ecoll(15,iq) |
|---|
| 822 | ec(j,i) = MIN( ek, 1.0_wp ) |
|---|
| 823 | ENDIF |
|---|
| 824 | |
|---|
| 825 | IF ( ec(j,i) < 1.0E-20_wp ) ec(j,i) = 0.0_wp |
|---|
| 826 | |
|---|
| 827 | ec(i,j) = ec(j,i) |
|---|
| 828 | |
|---|
| 829 | ENDDO |
|---|
| 830 | ENDDO |
|---|
| 831 | |
|---|
| 832 | DEALLOCATE( ira ) |
|---|
| 833 | |
|---|
| 834 | END SUBROUTINE effic |
|---|
| 835 | |
|---|
| 836 | |
|---|
| 837 | !------------------------------------------------------------------------------! |
|---|
| 838 | ! Description: |
|---|
| 839 | ! ------------ |
|---|
| 840 | !> Interpolation of turbulent enhancement factor for collision efficencies |
|---|
| 841 | !> following Wang and Grabowski (2009, Atmos. Sci. Let.) |
|---|
| 842 | !------------------------------------------------------------------------------! |
|---|
| 843 | SUBROUTINE turb_enhance_eff |
|---|
| 844 | |
|---|
| 845 | USE particle_attributes, & |
|---|
| 846 | ONLY: radius_classes |
|---|
| 847 | |
|---|
| 848 | IMPLICIT NONE |
|---|
| 849 | |
|---|
| 850 | INTEGER(iwp) :: i !< |
|---|
| 851 | INTEGER(iwp) :: iq !< |
|---|
| 852 | INTEGER(iwp) :: ir !< |
|---|
| 853 | INTEGER(iwp) :: j !< |
|---|
| 854 | INTEGER(iwp) :: k !< |
|---|
| 855 | INTEGER(iwp) :: kk !< |
|---|
| 856 | |
|---|
| 857 | INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: ira !< |
|---|
| 858 | |
|---|
| 859 | LOGICAL, SAVE :: first = .TRUE. !< |
|---|
| 860 | |
|---|
| 861 | REAL(wp) :: particle_radius !< |
|---|
| 862 | REAL(wp) :: pp !< |
|---|
| 863 | REAL(wp) :: qq !< |
|---|
| 864 | REAL(wp) :: rq !< |
|---|
| 865 | REAL(wp) :: y1 !< |
|---|
| 866 | REAL(wp) :: y2 !< |
|---|
| 867 | REAL(wp) :: y3 !< |
|---|
| 868 | |
|---|
| 869 | REAL(wp), DIMENSION(1:11), SAVE :: rat !< |
|---|
| 870 | REAL(wp), DIMENSION(1:7), SAVE :: r0 !< |
|---|
| 871 | |
|---|
| 872 | REAL(wp), DIMENSION(1:7,1:11), SAVE :: ecoll_100 !< |
|---|
| 873 | REAL(wp), DIMENSION(1:7,1:11), SAVE :: ecoll_400 !< |
|---|
| 874 | |
|---|
| 875 | ! |
|---|
| 876 | !-- Initial assignment of constants |
|---|
| 877 | IF ( first ) THEN |
|---|
| 878 | |
|---|
| 879 | first = .FALSE. |
|---|
| 880 | |
|---|
| 881 | r0 = (/ 10.0_wp, 20.0_wp, 30.0_wp, 40.0_wp, 50.0_wp, 60.0_wp, & |
|---|
| 882 | 100.0_wp /) |
|---|
| 883 | |
|---|
| 884 | rat = (/ 0.0_wp, 0.1_wp, 0.2_wp, 0.3_wp, 0.4_wp, 0.5_wp, 0.6_wp, & |
|---|
| 885 | 0.7_wp, 0.8_wp, 0.9_wp, 1.0_wp /) |
|---|
| 886 | ! |
|---|
| 887 | !-- Tabulated turbulent enhancement factor at 100 cm**2/s**3 |
|---|
| 888 | ecoll_100(:,1) = (/ 1.74_wp, 1.74_wp, 1.773_wp, 1.49_wp, & |
|---|
| 889 | 1.207_wp, 1.207_wp, 1.0_wp /) |
|---|
| 890 | ecoll_100(:,2) = (/ 1.46_wp, 1.46_wp, 1.421_wp, 1.245_wp, & |
|---|
| 891 | 1.069_wp, 1.069_wp, 1.0_wp /) |
|---|
| 892 | ecoll_100(:,3) = (/ 1.32_wp, 1.32_wp, 1.245_wp, 1.123_wp, & |
|---|
| 893 | 1.000_wp, 1.000_wp, 1.0_wp /) |
|---|
| 894 | ecoll_100(:,4) = (/ 1.250_wp, 1.250_wp, 1.148_wp, 1.087_wp, & |
|---|
| 895 | 1.025_wp, 1.025_wp, 1.0_wp /) |
|---|
| 896 | ecoll_100(:,5) = (/ 1.186_wp, 1.186_wp, 1.066_wp, 1.060_wp, & |
|---|
| 897 | 1.056_wp, 1.056_wp, 1.0_wp /) |
|---|
| 898 | ecoll_100(:,6) = (/ 1.045_wp, 1.045_wp, 1.000_wp, 1.014_wp, & |
|---|
| 899 | 1.028_wp, 1.028_wp, 1.0_wp /) |
|---|
| 900 | ecoll_100(:,7) = (/ 1.070_wp, 1.070_wp, 1.030_wp, 1.038_wp, & |
|---|
| 901 | 1.046_wp, 1.046_wp, 1.0_wp /) |
|---|
| 902 | ecoll_100(:,8) = (/ 1.000_wp, 1.000_wp, 1.054_wp, 1.042_wp, & |
|---|
| 903 | 1.029_wp, 1.029_wp, 1.0_wp /) |
|---|
| 904 | ecoll_100(:,9) = (/ 1.223_wp, 1.223_wp, 1.117_wp, 1.069_wp, & |
|---|
| 905 | 1.021_wp, 1.021_wp, 1.0_wp /) |
|---|
| 906 | ecoll_100(:,10) = (/ 1.570_wp, 1.570_wp, 1.244_wp, 1.166_wp, & |
|---|
| 907 | 1.088_wp, 1.088_wp, 1.0_wp /) |
|---|
| 908 | ecoll_100(:,11) = (/ 20.3_wp, 20.3_wp, 14.6_wp, 8.61_wp, & |
|---|
| 909 | 2.60_wp, 2.60_wp, 1.0_wp /) |
|---|
| 910 | ! |
|---|
| 911 | !-- Tabulated turbulent enhancement factor at 400 cm**2/s**3 |
|---|
| 912 | ecoll_400(:,1) = (/ 4.976_wp, 4.976_wp, 3.593_wp, 2.519_wp, & |
|---|
| 913 | 1.445_wp, 1.445_wp, 1.0_wp /) |
|---|
| 914 | ecoll_400(:,2) = (/ 2.984_wp, 2.984_wp, 2.181_wp, 1.691_wp, & |
|---|
| 915 | 1.201_wp, 1.201_wp, 1.0_wp /) |
|---|
| 916 | ecoll_400(:,3) = (/ 1.988_wp, 1.988_wp, 1.475_wp, 1.313_wp, & |
|---|
| 917 | 1.150_wp, 1.150_wp, 1.0_wp /) |
|---|
| 918 | ecoll_400(:,4) = (/ 1.490_wp, 1.490_wp, 1.187_wp, 1.156_wp, & |
|---|
| 919 | 1.126_wp, 1.126_wp, 1.0_wp /) |
|---|
| 920 | ecoll_400(:,5) = (/ 1.249_wp, 1.249_wp, 1.088_wp, 1.090_wp, & |
|---|
| 921 | 1.092_wp, 1.092_wp, 1.0_wp /) |
|---|
| 922 | ecoll_400(:,6) = (/ 1.139_wp, 1.139_wp, 1.130_wp, 1.091_wp, & |
|---|
| 923 | 1.051_wp, 1.051_wp, 1.0_wp /) |
|---|
| 924 | ecoll_400(:,7) = (/ 1.220_wp, 1.220_wp, 1.190_wp, 1.138_wp, & |
|---|
| 925 | 1.086_wp, 1.086_wp, 1.0_wp /) |
|---|
| 926 | ecoll_400(:,8) = (/ 1.325_wp, 1.325_wp, 1.267_wp, 1.165_wp, & |
|---|
| 927 | 1.063_wp, 1.063_wp, 1.0_wp /) |
|---|
| 928 | ecoll_400(:,9) = (/ 1.716_wp, 1.716_wp, 1.345_wp, 1.223_wp, & |
|---|
| 929 | 1.100_wp, 1.100_wp, 1.0_wp /) |
|---|
| 930 | ecoll_400(:,10) = (/ 3.788_wp, 3.788_wp, 1.501_wp, 1.311_wp, & |
|---|
| 931 | 1.120_wp, 1.120_wp, 1.0_wp /) |
|---|
| 932 | ecoll_400(:,11) = (/ 36.52_wp, 36.52_wp, 19.16_wp, 22.80_wp, & |
|---|
| 933 | 26.0_wp, 26.0_wp, 1.0_wp /) |
|---|
| 934 | |
|---|
| 935 | ENDIF |
|---|
| 936 | |
|---|
| 937 | ! |
|---|
| 938 | !-- Calculate the radius class index of particles with respect to array r0 |
|---|
| 939 | !-- The droplet radius has to be given in microns. |
|---|
| 940 | ALLOCATE( ira(1:radius_classes) ) |
|---|
| 941 | |
|---|
| 942 | DO j = 1, radius_classes |
|---|
| 943 | particle_radius = radclass(j) * 1.0E6_wp |
|---|
| 944 | DO k = 1, 7 |
|---|
| 945 | IF ( particle_radius < r0(k) ) THEN |
|---|
| 946 | ira(j) = k |
|---|
| 947 | EXIT |
|---|
| 948 | ENDIF |
|---|
| 949 | ENDDO |
|---|
| 950 | IF ( particle_radius >= r0(7) ) ira(j) = 8 |
|---|
| 951 | ENDDO |
|---|
| 952 | |
|---|
| 953 | ! |
|---|
| 954 | !-- Two-dimensional linear interpolation of the turbulent enhancement factor. |
|---|
| 955 | !-- The droplet radius has to be given in microns. |
|---|
| 956 | DO j = 1, radius_classes |
|---|
| 957 | DO i = 1, j |
|---|
| 958 | |
|---|
| 959 | ir = MAX( ira(i), ira(j) ) |
|---|
| 960 | rq = MIN( radclass(i) / radclass(j), radclass(j) / radclass(i) ) |
|---|
| 961 | |
|---|
| 962 | DO kk = 2, 11 |
|---|
| 963 | IF ( rq <= rat(kk) ) THEN |
|---|
| 964 | iq = kk |
|---|
| 965 | EXIT |
|---|
| 966 | ENDIF |
|---|
| 967 | ENDDO |
|---|
| 968 | |
|---|
| 969 | y1 = 1.0_wp ! turbulent enhancement factor at 0 m**2/s**3 |
|---|
| 970 | |
|---|
| 971 | IF ( ir < 8 ) THEN |
|---|
| 972 | IF ( ir >= 2 ) THEN |
|---|
| 973 | pp = ( MAX( radclass(j), radclass(i) ) * 1.0E6_wp - & |
|---|
| 974 | r0(ir-1) ) / ( r0(ir) - r0(ir-1) ) |
|---|
| 975 | qq = ( rq - rat(iq-1) ) / ( rat(iq) - rat(iq-1) ) |
|---|
| 976 | y2 = ( 1.0_wp - pp ) * ( 1.0_wp - qq ) * ecoll_100(ir-1,iq-1) + & |
|---|
| 977 | pp * ( 1.0_wp - qq ) * ecoll_100(ir,iq-1) + & |
|---|
| 978 | qq * ( 1.0_wp - pp ) * ecoll_100(ir-1,iq) + & |
|---|
| 979 | pp * qq * ecoll_100(ir,iq) |
|---|
| 980 | y3 = ( 1.0-pp ) * ( 1.0_wp - qq ) * ecoll_400(ir-1,iq-1) + & |
|---|
| 981 | pp * ( 1.0_wp - qq ) * ecoll_400(ir,iq-1) + & |
|---|
| 982 | qq * ( 1.0_wp - pp ) * ecoll_400(ir-1,iq) + & |
|---|
| 983 | pp * qq * ecoll_400(ir,iq) |
|---|
| 984 | ELSE |
|---|
| 985 | qq = ( rq - rat(iq-1) ) / ( rat(iq) - rat(iq-1) ) |
|---|
| 986 | y2 = ( 1.0_wp - qq ) * ecoll_100(1,iq-1) + qq * ecoll_100(1,iq) |
|---|
| 987 | y3 = ( 1.0_wp - qq ) * ecoll_400(1,iq-1) + qq * ecoll_400(1,iq) |
|---|
| 988 | ENDIF |
|---|
| 989 | ELSE |
|---|
| 990 | qq = ( rq - rat(iq-1) ) / ( rat(iq) - rat(iq-1) ) |
|---|
| 991 | y2 = ( 1.0_wp - qq ) * ecoll_100(7,iq-1) + qq * ecoll_100(7,iq) |
|---|
| 992 | y3 = ( 1.0_wp - qq ) * ecoll_400(7,iq-1) + qq * ecoll_400(7,iq) |
|---|
| 993 | ENDIF |
|---|
| 994 | ! |
|---|
| 995 | !-- Linear interpolation of turbulent enhancement factor |
|---|
| 996 | IF ( epsilon <= 0.01_wp ) THEN |
|---|
| 997 | ecf(j,i) = ( epsilon - 0.01_wp ) / ( 0.0_wp - 0.01_wp ) * y1 & |
|---|
| 998 | + ( epsilon - 0.0_wp ) / ( 0.01_wp - 0.0_wp ) * y2 |
|---|
| 999 | ELSEIF ( epsilon <= 0.06_wp ) THEN |
|---|
| 1000 | ecf(j,i) = ( epsilon - 0.04_wp ) / ( 0.01_wp - 0.04_wp ) * y2 & |
|---|
| 1001 | + ( epsilon - 0.01_wp ) / ( 0.04_wp - 0.01_wp ) * y3 |
|---|
| 1002 | ELSE |
|---|
| 1003 | ecf(j,i) = ( 0.06_wp - 0.04_wp ) / ( 0.01_wp - 0.04_wp ) * y2 & |
|---|
| 1004 | + ( 0.06_wp - 0.01_wp ) / ( 0.04_wp - 0.01_wp ) * y3 |
|---|
| 1005 | ENDIF |
|---|
| 1006 | |
|---|
| 1007 | IF ( ecf(j,i) < 1.0_wp ) ecf(j,i) = 1.0_wp |
|---|
| 1008 | |
|---|
| 1009 | ecf(i,j) = ecf(j,i) |
|---|
| 1010 | |
|---|
| 1011 | ENDDO |
|---|
| 1012 | ENDDO |
|---|
| 1013 | |
|---|
| 1014 | END SUBROUTINE turb_enhance_eff |
|---|
| 1015 | |
|---|
| 1016 | END MODULE lpm_collision_kernels_mod |
|---|
